If \( a_{1}, a_{2}, a_{3}, \ldots, a_{n+1} \) are in A.P., then \( \frac{1}{a_{1} a_{2}}+\frac{1...
If \( a_{1}, a_{2}, a_{3}, \ldots, a_{n+1} \) are in A.P., then \( \frac{1}{a_{1} a_{2}}+\frac{1}{a_{2} a_{3}}+\ldots . \frac{1}{a_{n} a_{n+1}} \), is
(A) \( \frac{n-1}{a_{1} a_{n+1}} \)
(B) \( \frac{1}{a_{1} a_{n+1}} \)
(C) \( \frac{n+1}{a_{1} a_{n+1}} \)
(D) \( \frac{n}{a_{1} a_{n+1}} \)
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